R600: BCNT_INT is a vector only instruction

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210702 91177308-0d34-0410-b5e6-96231b3b80d8
R600: Set correct InstrItinClass for instructions using *Helper classes

We weren't doing this before, so all instruction using the *Helper
classes were considered for any ALU slot.

This fixes a hang in the builtin-char-clz-1.0.generated.cl piglit test.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210703 91177308-0d34-0410-b5e6-96231b3b80d8